Speed-comparing device.



SPEED COMPARING DEVICE. APPLICATION FILED MAY 25, 1912.

witnesses Patented Sept. 24,1912.

earns ra onion,

Uttl E w Jenn- V. MATTHEWS Ann Ema/ En L. KYLE, or PHILADELPHIA, PENNSYLVANIA,

srnnneomramno DEVICE.

, 1 u Specification of Letters Patent. Patented Sept, 24,1?312,

I Application filed May 25, 1912. Serial No. 699,661.

. Jil n. whom it may concern:

, ,lle it known that we, .lonx V. ltlrthrr -mws y and limit-1n L. KYLE, citizens of the United mg posts 1\ and X ot the instrument.

lcontrol the respective circuits :0 a? and 3 1/, I l htates and residents ot Plnladelplna,\ A and A are electro-niagnets ot winch (30 whichrespectively connect with the hind- ,5 ounty of Philadelphia, and State otlenn It corresponds to the machine 1%. and A i l\'ania. have invented an Improvement in correspont to the machine B. 'lhese elec- 1v"fiptttlrt tllllPtlllllg DCYlCCS Of winch thei'oltic-magnets each operate an armature 's lowing is a specification. 1 which by means ot a pawl D moves a ratchet ()ur invention has reference to speed comwheel E with a step by step motion, the said 5 0 paring: devices and consists at certain im" ratchet wheel E and its shalt operating cyprox ements which are fullv set forth in the clometer dials l or other indicating; or refjt'ollowinc' specification and shown in the according devices of any well known characconumnving drawings which form a part t ter'tor indicating or recording the number jt/herai'l'. ot impulses given to the armature. -70 The object of our invention is to provide ll is a third electro-magnet, and operates suitable means for employment in connec an armature G which, through the. pawl J, -I-t'umwith two. machines to be compared as actuates a ratchet wheel K and thetwo com- *to their speeds, such as comparing the veimitators L and Ill secured to the same shalt lot-ities of any two machines that run conl with the ratchet wheel. These commutators 7 QO tiuuously at constant or variable speeds are provided on their peripheries with insu- Jthrough recurring cycles of operationf lating portions, as'clearly indicated in Fig. 1, m, CIThc object is to malte a comparative si- 2. The contact springs N and 0 respecimultaneous record or indication of the speed lively contact with the connnutators L and conditions ot the two machines, whereby M. This device, last referred to, controls go 25 their relativeconditions of running" may be the time of energizing ot the two electroreadily determined. magnets A A, but the electro-maguet H is Our invention consists of two electroitselt controlled by the operation of the two stungaettcallv operated indicators or recordwiping' or circuit closing contacts P Q, as ers respectively responding to the operation more clearly described hereinafter. 35 39- ot: circuit closing devices attached to the A circuit r connects with one of the ter- ;machines whose speeds are to be compared, minals of the electro-maguct H, and extends said, electroanagnetically operated speed in to one of the binding posts X and includes dicators or recorders being energized by a battery R. The other terminal of the jseparatcsources of electric energy and electroanagnet ll connects with a circuit 8 9o 35fwhose actimis upon the elcctro-n'iagnetic inwhich leads to and connects with one of f: dicator or recording devic are controlled thebinding'posts Y and includes a battery ,flby. an electro-imtgnetic'ally operated com- S. The remaining binding posts X and Y {'1 mutator mechanism, in turn controlled by are, connected by a circuit 1" s which'is also ,Jthe joint action of the circuit closing deelectro-magnctically connected with the 5 10 vices otthe two machines to be tested. commutator-s L and M through their sup- Our invention also comprehend-'1 details ports. The batteries R and S are so ar I of constrtmtion which, together with the ranged in their-circuits that it both con- H features above specified, will be better unt-acts P and Q. were closed at the some 1110- --derst'ood by reference to the drawings, in mcnt, a current would pass through the 0 -15 which I clectro-magnet H to energize it. It is evi- L Figure l is a diagrammatic elevation dent that in place of batteries .3 and Sother illustrating; our invention; and Fig. 2 is a sources'ot electric energy maybe employed. side elevation of one of the coimnutators The eleetro-mae'net A is arranged ina rand operating ratchet wheels. circuit a, one end of which connected 5 10- l; and B- represent the rotating shafts with the circuit 0* between the battery -o'l': two machines whose speeds are to be and the eleetro-magnet H, and the other ;-,,-,con1pa red, said shafts B and B being it end is connected with the contact spring or 5 direct portion of the machines or driven finger O which rests upon the commutator from the machines in a positive 11l2111t101.'.\l\"l. Similarly, the electro-magnet it is ar- 119 These shafts B B respectively operate cirranged in a circuit a, one end of which q cuit breakers or wiping contacts P Q, and 3 connected with 1 the circuit 5 between the I the movement of its armature C the eyclomethe circuits at and m, so as to prevent the battery S and the electro-niagi'tetxfi-iti, and tive velocities of the two machines are dithe other end of which is connected with rectly in the atio of the revolutions rethe spring finger or contact N resting upon corded or indicated on the two cyclomctcrs. the commutator L. It will be seen that the Our improvements are particularly well comniutators and the contact fingers will adapted to the calibration and :uljustmcntot' control the opening or closing of the cirelectric meters where a rotating" standard meter is used to compare the accuracy ot the The operation may be explained as folmeters under test. By putting wiping conlows: At the start of the tcst,.the contact tacts P Q upon the respective meters, the fingers N and O are on the insulated segnumber of revolutions made by each can ments of the commutators L and M. The quickly be determined by meansot' our imshafts B and are rotating at difi'erent proved devices for the same time interval velocities, and none of the electro-magnets or period, and the accuracy of the meter A A and H will be energized so long as the under test can thereby be easily calculated. contacts P and Q, do not close the circuits ur improvements, however, may he utizv w and 3 y at the same time, because underlized for various purposes in which the difany other condition than this latter the variference in speeds of any two machines, elecous circuits are open. When the speeds of trical or mechanical. are desired to be comthe two shafts B B do ultimately insure pared, and we therefore do not restrict our asimultaneous closing of the circuit closer; selves to any particular uses. I urthcrmorc, P and Q, then a circuit is completed through we do not r strict ourselvcsto the details of the electro-magnet H and the batteries R construction, as these may be modified in and S, the current from the said battery envarious ways without departing from the ergizing the electro-magnet and operating spirit of the invention. the armature G thereof to move the commu- Having now described our invention, what we claim as new and desire to secure by Letportions thereof are operated under the conters Patent, is

tact springs N and 0. As the two machines 1. In an instrument for comparing speeds being tested and-the shafts B B are rotatof two machines, the combination of two ing at difi erentvelocities, the contact at the sources of electric energy, two electrically circuit closer P is made either earlier or actuated indicating devices for respectively later than the contact at the circuit closer indicating the impulses imparted to them by on the next revolution of the machines tic respective sources of electric cncrgy, and the shafts B B. Then upon each sucseparate electric circuits for each source oi. cessive contact made by the circuit closer P, electric energy and each including one of a circuit is completed through m, 1", batter the electrically actuated indicating devices,

circuit a, electro-inagnct A, circuit a, a separate intermittent] acting circuit closcommutator spring 0, commutator M, cir ing means for each electric circuit and said cuit 1, and circuit m, with the result that mcans respectively operated by the two mathe electro-magnct A is energized, and by chines whose speeds or velocities are to be compared, a commutator for each of the electric circuits for simultaneously opening or closing said electric circuits, and an electrically actuated means for intermittently operating the commutators energized by the two sources of electric energy whenever the two circuit closing means of the two circuits are simultaneously closed.

2. In an instrument for comparing speeds ot two machines, the combination of two sources of electric energy, two electrically actuated indicating devices for respectively indicating the impulses imparted to them by the respective sources of electric cnci ter dials are moved to indicate or record such an impulse due to the closing of the circuit closer P. In the same manner, the circuit closer Q; controls a circuit 7 s, battery S, circuit a, elcctrounagnct A, circuit a, commutator spring N, commutatoriL, circuit 8, and circuit ;1 with the result that the elcctro-magnct A is operated to register or record the impulse by means of its dials. Both magnets A and A will continue to operate in this manner until the circuitclosingdevices 1 and Q once again simultancously close their circuits. i hen this occurs, the electro-magnet H is again actuated, uioving, the cmumutator wheels under the contact lingers O and N, and thereby breaking the electrically actuated indicating devices, a separate intermittently acting circuit closing means for each electric circuit and said means respectively operated by the two machines whose speeds or velocities are to be cyclomctcr dials have each rccrn'dcd tll0l(.'0ll1p2li(3(l, a cornn'iutator "for each of the number of revolutions made by the rcspccl electric c tor sinuilhiucously opening;- tive machines to which their circuits are atl or closins a electric circuits. and an clcctached for the same time interval. The rcla.-- tricaliy acti an elecenergizing of the electro mag'ncts A and A respectively. In the above cycles of operations, it will be seen that the two sets ot 1 separate electric circuits. for each source oi electric energy and each including one of l tro-1nagnet and a branch circuit therefor having its terminals in circuit with the poles of thesources of electric energy which connect with the electrically actuated indicating devices for intermittently operating the coinmutators energizcl by the tvvu sources of electric energy whenever the two circuit closing means of the two circuits are simul taneously closed. 3. In an instrument for comparing speeds of two machines, the combination of two sources of electric energy, two electrically aetuated indicatingdevicesfor respectively indicai' ing the impulses imparted to them by the respective sources of electric energy,separate electric circuits for each source of electric energy and each including one of the electrically actuated indicating devices, a separate intermittently acting circuit closing means for each electric circuit and said means respectively operated by the two machines whose speeds or velocities are to be compared, and devices for closing both of the separate electric circuits through the respective sources of electric energy Whenever the circuit closing means operated by the two machines whose velocities are to be compared are simultaneously closed.

In testimony of which invention we hereunto set our h ands JOHN V.

MATTHEWS. ELMER L. KYLE. Witnesses:

R. M. HUNTER, R. M. KELLY.

simultaneously 

